--- net/base/mime_util.cc	2013-08-25 10:12:05.428599992 +0200
+++ net/base/mime_util.cc	2013-08-25 10:12:05.428599992 +0200
@@ -376,6 +376,7 @@
   "text/x-csv",
   "text/x-vcf",
   "text/rtf",
+  "text/x-pisi-ymp",
   "text/comma-separated-values",
   "text/csv",
   "text/tab-separated-values",
